package com.webserver.core;

import com.webserver.annotation.Controller;
import com.webserver.annotation.RequestMapping;

import java.io.File;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;

/**
 * 用来维护所有请求路径与对应的Controller中的处理方法
 */
public class HandlerMapping {
    private static Map<String,MethodMapping> mapping = new HashMap<>();
    static {
        initMapping();
    }
    private static void initMapping(){
        try {
            File dir = new File(
                    HandlerMapping.class.getClassLoader().getResource("./com/webserver/controller").toURI()
            );
            File[] files = dir.listFiles(f->f.getName().endsWith(".class"));
            for(File file:files){
                Class cls = Class.forName("com.webserver.controller."+file.getName().split(".class")[0]);
                if (cls.isAnnotationPresent(Controller.class)){
                    Object o = cls.newInstance();
                    Method[] methods = cls.getDeclaredMethods();
                    for (Method method:methods){

                        if (method.isAnnotationPresent(RequestMapping.class)){
                            RequestMapping rm = method.getAnnotation(RequestMapping.class);
                            String path = rm.value();
                            MethodMapping methodMapping = new MethodMapping(o,method);
                            mapping.put(path,methodMapping);

                        }
                    }
                };
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 根据请求路径返回对应的处理方法
     * @param path
     * @return
     */
    public static MethodMapping getMethod(String path){
        return mapping.get(path);
    }

    public static class MethodMapping{
        private Object controller;
        private Method method;

        public MethodMapping(Object controller, Method method) {
            this.controller = controller;
            this.method = method;
        }

        public Object getController() {
            return controller;
        }

        public void setController(Object controller) {
            this.controller = controller;
        }

        public Method getMethod() {
            return method;
        }

        public void setMethod(Method method) {
            this.method = method;
        }
    }
}
